<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h3>给用户提供上传文件的页面</h3>
    <form action="/upload" method="post" enctype="multipart/form-data">
        用户名:<input type="text" name="username"><br/>
        邮箱  :<input type="text" name="email"><br/>
        头像  :<input type="file" name="avatar"><br/>

        <input type="submit" value="点我提交">

    </form>
</body>
</html>